# Copyright (C) 1995 John W. Eaton
# 
# This file is part of Octave.
# 
# Octave is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
# 
# Octave is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.
# 
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING.  If not, write to the Free
# Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

function map = gray (number)

# Colormap.

# Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.

  if (nargin == 0)
    number = 64;
  elseif (nargin > 1)
    usage ("gray (number)");
  endif

  gr = [0:(number-1)]';

  map = [ gr, gr, gr ] / (number - 1);

endfunction